Pressure equalizer for oil burners



Jan. 24, 1928,.

- D. E. DE VELBISS PRESSURE EQUALIZER FOR OIL BURNERS Filed March 31A 1926 Patented Jan. 24, 19228.

i UNITED STATES llgrlszlv'roFFicra.y l

DAVID E. DE VELBISS, OF SANFRAN CISCO, CALIFORNIA, ASVSIGrllIORTO` PACIFIC COAST IANUFAGTUBING COMPANY, OF RENO, NEVADA, A CORPORATION OF NEVADA.. y

PBESKSURE EQIJALIZER FOR OIL BURNERS.

Application led March 31, 1926.` Serial No. 98,7812.

especially intended fory use in connection with an oil-burner, in which steam under boiler pressure, and .oil under pump pressure are supplied to the burner.

As the steam and oil should be supplied in predetermined volume ratio, and as the voliime of thesteam lowing to the burner va-V ries markedly with the boiler pressure, and as, iinally,the oil volume is approximately constant due to the pumping pressure (the slight pump-pulsation variation being `for the moment disregarded) `it is apparent that as the boiler pressure varies, the volume ratio of the two fluids will vary considerably;1

By my invention, without mechanical connection between the independent pressureregulating devices of the two liuids, the regulated steam pressure is made to directly, automatically and correspondingly vary the oil pressure; and by so equalizing the pressures, the predetermined volume ratio is preserved.

In the accompanying drawing in which the figure is a vertical section ofmy pressure equalizer, I show the preferred form of the device, it being understood that changes in form, arrangement and structure may be made without departing from the spirit of the invention as delined in the claims hereunto appended.

The device as here illustrated comprises a shell consisting of three flanged sect-ions which from the top downwardly are designated by the numerals l, 2and 3, said sections belng assembled by the bolts el. l

In the middle section 2 is the inlet 5 for the steam connection from the boiler, and

the outlet 6 for the steam connection to the` burner.

In the lower section 3 is the inlet 7 for the oil connection from the pump, and the outlet 8 for the oil connection to the burner.

Between the steam inlet 5 and outlet 6 is avalve seat 9 with which is associated a valve 10 of the balanced type. The stem 11 of this valve has its` upper 'end fitted in a head piece 12 carried by a diaphragm 13 secured betweenlthe bolted flanges of the upper and middle shell sections 1 and 2.`

A 'diaphragar-controlling spring 14 if.:`

housed within the upper shell section 1 and bears upon the head piece 12, said spring` being adapted for tension adjustment by means oi' the head screw 15. rlhe lower end of the valve ,stemr 11 has itted to it a small spring 16 to insure the closing of the valve in the absence of pressure. l

Between the oil inlet 7 Aand outlet 8 is a valve seat 17 in which is a valve18 of the balanced type. The stem 19 or' valve 18 is iitted in a head piece 2O carried by a diaphragm 2l `secured between the bolted iianges of the middle and lower shellsections 2 and 3. u

` Ausmall spring 22 at the valve stem insures the closing of the valve upon release of pressure. l l

v In the middle shell section 2 is a by-pa'ss 23lea`ding from the outlet side or' the steam valve 10 and opening out into the space above the diaphragm 21.

The operation of the device will now readily be understood. Whatever steam pressure may be at the outlet side 6 of the dia- `lower end of the i phragm-controlled steam-valve 10, is, by the Icy-pass 23, imposed in equal degree upon the diaphragm 21, and said diaphragm, through the oil valve 18 establishesalike'` degree of oil pressure on the outlet side 8 y of the oil valve 18. Thus at the outlets of both steam and oil, the respective pressures' thatwhatever may be the variation in the` regulated steam pressure the volume pro portions of the two tluids will be kept constant. l

It may further be noted that this automatic equalizing of the pressures of the two fluids through the instrumentality of the direct imposition of the outlet pressure `of the steam, serves also to practically eliminate on the outlet side olI the` oil Valve, the slight` pressure variation clueljtotlre pulsetion oi'. tlie pump.`

I claim LSA pressure equalizer for plurali kfiniti streams under :independent lznessures,` com: prising u shell consisting"ofthree flanged sections in Successive unitary nssemblegegtlie" middle section having aninlet and `en outlet for one of said liuid streams, zincllne of tlie end sections lmving an inlet and :in` outlet for theoilier of "snicl fluid sti-sains; niiulve in the "middle section 'controlling Ithe pas! sage of the lirst named stretnnlr from its inlet toits outlet; s seperate` telve in -tlie end section for controlling` tlie',pussege of the second nunecl stream fronifits' inlet` to" outlet; e spring` controlled4 pressureftlief hragm sented in l and trzriffersing the `union lietwe'en the, iniclclle section fanl "the other enfl section, saitl dieplirgm being connected4 with and controlling the valve in Seial iniclelle section; a Isecond pressure cli'npliregni seated in and traversing the `union between the middle section und the first naniel end section, seifl`- diaphragm being connected with and controlling the vulve in said first named section; and u lay-pass formeel" Witlii'n the middle section, ndapteclto impose "the fluid pressure of the outlet side oztftheirst named luicl stream upon" the diaphragm connected with the valve controlling the seconduicl stream.

`st-rezguns under independent pressure outlet;` e .spring` controlled presen`r`e` spectvely, for returning said `rabies 2; A pressure equalizer A prising"` a, shelll consisting"` of three `flanged sections insuccesslve unitary assemblage, the

middle section having an inlet and an outlet torrone osi;` said fluid"strellnsltandWHQLof theencl sections having m `inlet 'and im outlet for the other of said :Huid streams; u relire inlthemidille section controllingr the passa-ge of the first named stream from its inlet to its outletg""a` separate valve in the encl section for controlling the pzlssage of the second named streini` troni` its finletj `tolli hregni sented in". and tretersinr tle i t ion 'etween tlie middlescctio unil the ther end section, saiclcliupliregm beiiigconnectell with and controlling the "iurliie "in sicl "miel `elle section; u `s"econd` pressure cliuplintgtti com- 35 

